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Search: id:A071152
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| A071152 |
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Lukasiewicz words for the rooted plane binary trees (interpretation d in Stanley's exercise 19) with the last leaf implicit, i.e. these words are given without the last trailing zero, except for the null tree which is encoded as 0. |
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3
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| 0, 20, 2020, 2200, 202020, 202200, 220020, 220200, 222000, 20202020, 20202200, 20220020, 20220200, 20222000, 22002020, 22002200, 22020020, 22020200, 22022000, 22200020, 22200200, 22202000, 22220000, 2020202020, 2020202200
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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A. Karttunen, Gatomorphisms and other excursions amidst the plane trees & parenthesizations (Includes the complete Scheme program for computing this sequence)
R. P. Stanley, Hipparchus, Plutarch, Schrö der and Hough, Am. Math. Monthly, Vol. 104, No. 4, p. 344, 1997.
R. P. Stanley, Exercises on Catalan and Related Numbers
Index entries for sequences related to Lukasiewicz words
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CROSSREFS
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A071152(n) = 2*A063171(n) = A071153(A057123(n)). Cf. also A071153, A071154, A014486.
Sequence in context: A014606 A072818 A123479 this_sequence A064878 A028458 A079759
Adjacent sequences: A071149 A071150 A071151 this_sequence A071153 A071154 A071155
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KEYWORD
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nonn
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AUTHOR
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Antti Karttunen May 14 2002
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